Error Messages

Rinnai water heaters have the ability to check their own operation continuously. If a fault occurs, an error code will flash on the Digital Display if you have temperature controllers installed. This assists with diagnosing the fault, and may enable you to overcome a problem without a service call. Please quote the code displayed when enquiring about service. Some of these remedies can not be checked by the user because they require the front to be taken off of the unit. They are included so that you can give the information to the gas engineer.

Code	Fault	Remedy
Displayed

-	Noticeable reduction in water	Inlet water filter needs to be cleaned.
	flow

10	Not enough combustion air	Check for physical blockages around
		air intake or exhaust. Check combus-
		tion fan.
11	No Ignition / Gas supply	Check gas valves, gas supply and
		ignition unit.

12	Flame failure / Earth Leakage	Check gas valves and gas supply.
		Check flame rod.
		Check earth wire lead.
		Check remote control.

14	High flame safety device	Check overheat circuit

16	Over temperature warning	Modulating control valve problem or
		water flow control valve problem
32	Outgoing water temperature	Check Hot Water Thermistor and wire
	sensor faulty

34	Combustion Air temperature	Check Air Intake Thermistor and wire
34	sensor faulty
	sensor faulty

52	Gas modulating valve faulty	Check gas modulating valve and pcb.

61	Combustion fan failure	Check Combustion Fan

71	Micro-processor failure or Sole-	Check solenoids and pcb.
	noid circuit failure
72	Flame rod circuit error	Check flame rod and pcb.

*In all cases, you may be able to clear the Error code by turning the hot water tap OFF, then ON again. If this does not clear the error, try pushing the On/Off button OFF then ON again. If the Error Code still remains contact Rinnai or your nearest service agent for advice.

**Faults caused by insufficient gas/water supply or gas/water quality and installation errors are not covered by the manufacturer’s warranty.

Regular maintenance should be performed by a competent person in accordance with the local regulations at least once annually.

REU - 16 FUA - E specifications

The Rinnai REU-16 FUA-E is a cutting-edge tankless water heater designed for efficiency and convenience. This model is part of Rinnai's renowned line of high-performance appliances, catering to both residential and commercial applications. It boasts a sleek design coupled with advanced technology that sets it apart in the crowded water heating market.

One of the most notable features of the REU-16 FUA-E is its impressive heating capacity. It is capable of delivering hot water on demand, with a maximum output of 16 liters per minute. This means you can comfortably run multiple hot water fixtures simultaneously without experiencing a drop in temperature or flow rate. Whether you’re taking a shower, running the dishwasher, or washing clothes, this unit meets the demand with ease.

The REU-16 FUA-E employs a state-of-the-art condensing technology, which enhances its efficiency by capturing and reusing some of the heat that would otherwise escape through the flue. This allows for an energy efficiency rating of up to 95%, significantly reducing energy bills and environmental impact compared to traditional storage water heaters.

Another key characteristic of this unit is its compact size. The Rinnai REU-16 FUA-E can be installed in smaller spaces, making it an ideal option for apartments, houses, or commercial properties with limited room for bulky tank units. Its flexibility in installation positions—whether indoors or outdoors—provides additional versatility to users.

Safety is also a primary concern with the REU-16 FUA-E. It comes equipped with numerous safety features, including an anti-freezing function, overheat protection, and venting safety controls. These safeguards ensure safe operation for you and your family, providing peace of mind whether it’s running constantly or in standby mode.

In terms of controls, the Rinnai REU-16 FUA-E offers modern digital displays that provide real-time monitoring of water temperature and status. This user-friendly interface makes it easier for homeowners or users to adjust settings according to their preferences.

Overall, the Rinnai REU-16 FUA-E encapsulates innovation and efficiency in water heating. Its combination of advanced technology, high performance, compact design, and safety features makes it a reliable choice for those seeking a consistent supply of hot water without the limitations of traditional systems. Whether for residential use or commercial applications, the REU-16 FUA-E is engineered to provide lasting performance and convenience.

ERROR MESSAGES

Code

Fault

Remedy

Displayed

REU - 16 FUA - E specifications